Fix tests

plugins/python-build/test/checksum.bats

@@ -103,7 +103,6 @@ export PYTHON_BUILD_CACHE_PATH=
 @test "existing tarball in build location is reused" {
   stub shasum true "echo ba988b1bb4250dee0b9dd3d4d722f9c64b2bacfc805d1b6eba7426bda72dd3c5"
   stub curl false
-  stub curl false
   stub wget false
 
   export -n PYTHON_BUILD_CACHE_PATH

plugins/python-build/test/fetch.bats

@@ -20,7 +20,7 @@ setup() {
 
 @test "using aria2c if available" {
   export PYTHON_BUILD_ARIA2_OPTS=
-  export PYTHON_BUILD_HTTP_CLIENT="aria2c"
+  export -n PYTHON_BUILD_HTTP_CLIENT
   stub aria2c "--allow-overwrite=true --no-conf=true -o * http://example.com/* : cp $FIXTURE_ROOT/\${5##*/} \$4"
 
   install_fixture definitions/without-checksum

plugins/python-build/test/test_helper.bash

@@ -1,11 +1,14 @@
 export TMP="$BATS_TEST_DIRNAME/tmp"
-export RUBY_BUILD_CURL_OPTS=
-export RUBY_BUILD_HTTP_CLIENT="curl"
+export PYTHON_BUILD_CURL_OPTS=
+export PYTHON_BUILD_HTTP_CLIENT="curl"
 
 if [ "$FIXTURE_ROOT" != "$BATS_TEST_DIRNAME/fixtures" ]; then
   export FIXTURE_ROOT="$BATS_TEST_DIRNAME/fixtures"
   export INSTALL_ROOT="$TMP/install"
-  PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"
+  PATH="/usr/bin:/bin:/usr/sbin:/sbin"
+  if [ "FreeBSD" = "$(uname -s)" ]; then
+    PATH="/usr/local/bin:$PATH"
+  fi
   PATH="$BATS_TEST_DIRNAME/../bin:$PATH"
   PATH="$TMP/bin:$PATH"
   export PATH